function s() {
	 let tr = document.querySelectorAll('#table tr');
     let all = document.querySelector('#all');
     let allnum = 0

     for (let i = 0; i < tr.length; i++) {
	     var price = tr[i].children[2].children[0].innerHTML;
	     var num = tr[i].children[3].children[0].value;

	     var total = tr[i].children[4].children[0].innerHTML = price * num;
	     console.log(total);
	     allnum += total;
     }

     console.log(allnum)
     all.innerHTML = allnum.toFixed(2);
}
s()

//只要数量的input内容发生改变，小鸡和总价就会更新

let num_all =document.querySelectorAll('#table .num');
for (let j = 0; j < num_all.length; j++) {
	num_all[j].addEventListener('change',s)
}

//删除操作之后，再根据小计计算总价
//
let del_all = document.querySelectorAll('#table .del');
for(let k = 0; k < del_all.length; k++){
   del_all[k].addEventListener('click',function(){
   	  console.log(this.parentNode.parentNode.parentNode);
   	  console.log(this.parentNode.parentNode)
   	  this.parentNode.parentNode.parentNode.removeChild(this.parentNode.parentNode)

   	  s()
   })
}

